package com.wsx.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;

import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.github.pagehelper.PageSerializable;
import com.wsx.common.R;
import com.wsx.entity.Employee;
import com.wsx.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/employee")
public class EmployeeController {
    @Autowired
    private EmployeeService employeeService;

    /**
     *      员工登录
     *          1.负责接收前端发送的请求参数为json，使用@RequestBody接收并封装为Employee对象，json的key要和对象的属性值一样
     *          2.设置HttpServletRequest对象，把登录成功后的员工id保存到session域对象中给其他请求获取，表示登录成功
     */
    @PostMapping("/login")
    public R<Employee> login(HttpServletRequest request, @RequestBody Employee employee){
        //1、将页面提交的密码password进行md5加密处理
        String password = employee.getPassword();
        byte[] bytes = password.getBytes();
        System.out.println("DigestUtils工具类的md5DigestAsHex方法要传入byte数组," +
                "调用Stirng的getBytes()把String类型转成byte字节数组" +
                ",通过ASCII编码可以查看变化:"+bytes[1]+bytes[2]+bytes[3]);
        password = DigestUtils.md5DigestAsHex(bytes);

        //2、根据页面提交的用户名username查询数据库
/*        LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Employee::getUsername,employee.getUsername());*/
        //调用getOne的原因是因为username字段在数据库中添加了unique索引，也就是唯一约束。既然是唯一就可以调用getOne方法，查出唯一的数据
/*        Employee emp = employeeService.getOne(queryWrapper);*/
        Employee emp = employeeService.getSelectByName(employee.getUsername());

        //3、如果没有查询到则返回登录失败结果
        if(emp == null){
            return R.error("登录失败,用户不存在");
        }

        //4、密码比对，如果不一致则返回登录失败结果
        if(!emp.getPassword().equals(password)){
            return R.error("登录失败,密码错误");
        }

        //5、查看员工状态，如果为已禁用状态，则返回员工已禁用结果
        if(emp.getStatus() == 0){
            return R.error("员工账号已禁用");
        }

        //6、登录成功，将员工id存入Session并返回登录成功结果
        request.getSession().setAttribute("employee",emp.getId());

        return R.success(emp);
    }

    /**
     *      员工退出
     */
    @PostMapping("/logout")
    public R<String> logout(HttpServletRequest request){
        //清理Session中保存的当前登录员工的id
        request.getSession().removeAttribute("employee");
        return R.success("退出成功");
    }

    /**
     *      新增员工
     */
    @PostMapping
    public R<String> save(HttpServletRequest request,@RequestBody Employee employee){
        log.info("新增员工，员工信息：{}",employee.toString());

        //设置初始密码123456，需要进行md5加密处理
        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));

//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
//
//        //获得当前登录用户的id
//        Long empId = (Long) request.getSession().getAttribute("employee");
//
//        employee.setCreateUser(empId);
//        employee.setUpdateUser(empId);

        //employeeService.save(employee);
        employeeService.insertEmployee(employee);
        return R.success("新增员工成功");
    }

    /**
     * 员工信息分页查询
     * @param page 当前查询页码
     * @param pageSize 每页展示记录数
     * @param name 员工姓名 - 可选参数
     * @return
     */
    @GetMapping("/page")
    public R<Page> mybatisPlusPage(int page, int pageSize, String name){
        log.info("分页查询员工信息,page = {},pageSize = {},name = {}" ,page,pageSize,name);
        //构造分页构造器
        Page pageInfo = new Page(page,pageSize);

        //构造条件构造器
        LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper();
        //添加过滤条件,前提是条件不为空，才会添加过滤条件
        queryWrapper.like(StringUtils.isNotEmpty(name),Employee::getName,name);
        //添加排序条件
        queryWrapper.orderByDesc(Employee::getUpdateTime);

        //执行查询
        employeeService.page(pageInfo, queryWrapper);
        return R.success(pageInfo);
    }

    /**
     * 员工信息分页查询
     * @param page 当前查询页码
     * @param pageSize 每页展示记录数
     * @param name 员工姓名 - 可选参数
     * @return
     */
    @GetMapping("/mybatisPage")
    public R<PageInfo> mybatisPage(int page, int pageSize, String name){
        log.info("分页查询员工信息,page = {},pageSize = {},name = {}" ,page,pageSize,name);
        PageInfo selectByMybatisPage = employeeService.getSelectByMybatisPage(page, pageSize);
        return R.success(selectByMybatisPage);
    }

    /**
     * 根据id修改员工信息
     *      1.启用和禁用员工，其实也是修改，只不过我们不需要把每个字段都修改
     *      2.编辑员工信息，其实就是看条件修改员工信息
     */
    @PutMapping
    public R<String> update(HttpServletRequest request , @RequestBody Employee employee){
        log.info("根据id修改员工信息, 员工信息{}",employee.toString());
        long id = Thread.currentThread().getId();
        log.info("线程id为：{}",id);

       /* Long empId = (Long)request.getSession().getAttribute("employee");

        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(empId);*/
        employeeService.updateByEmployee(employee);
//        employeeService.updateById(employee);

        return R.success("员工信息修改成功");
    }

    /**
     * 根据id查询员工信息
     */
    @GetMapping("/{id}")
    public R<Employee> getById(@PathVariable Long id){
        log.info("根据id查询员工信息, id值为{}",id);
        Employee employee = employeeService.getById(id);
        if(employee != null){
            return R.success(employee);
        }
        return R.error("没有查询到对应员工信息");
    }
}
